#include <fstream>
using namespace std;
ifstream in("mins.in");
ofstream out("mins.out");
int c,d,m;
short a[1000001];
long long r;
bool ok[1000001];
int main()
{ in>>c>>d;
  c--,d--;
  m=min(c,d);
  for(int i=1;i<=m;++i)
    a[i]=1;
  for(int i=2;i<=m;++i)
    if(!ok[i])
       for(int j=i;j<=m;j+=i)
         a[j]*=-1,ok[j]=1;
  for(int i=2;i*i<=m;++i)
    for(int j=1;i*i*j<=m;++j)
      a[i*i*j]=0;
  r=1LL*c*d;
  for(int i=2;i<=m;++i)
    r+=1LL*a[i]*(c/i)*(d/i);
  out<<r;
  in.close();
  out.close();
  return 0;
}